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chiennguyen7721
2 năm trước
Một ô tô đi từ A đến B với vận tốc 30km/giờ. 1 giờ 30 phút sau, một xe máy cũng đi cũng đi từ A với vận tốc 40km/giờ. Hỏi quãng đường AB dài bao nhiêu km ?
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